cccc ccci ccgc ccgt ccic ccii ccoc cctc cctt cgcc cgcg cicc cici cico cict cigi ciii ciit citg citi cito citt city coco coct cogi cogo coit coot cotc coti coto cott coty coyo coyt ctic ctot cyc- cycc cyt- cyto cyy- cyyc gc-c gccc gcic gcii gctc gggg gigg gigi gigo giog gioi gito gogi gogo goit goog gooi goot goti goto gott goty goyt gtco gytt i-go iccc icci icco icct icgc icoc igcc iggy igoo igot iiii iiio iiit iioi iioo iitt iocg ioci iogt ioii ioio ioit iooi iooo ioto itgc itgo itic itoi itoo itto itty occc occi occt oct- octi octo octy oggi oggy ogog ogoi oici oigo oiii oitc oiti oooo ooty otic otit oto- otog otoo otoy otti otto otyg tccc tctc tgcc tgtc ticc tico tigi tigy tiit titc titi tito titt tiyi tiyo to-y toci toco togo togt toit toot totc toti toto tott toty toyo toyt ttoy tttt tyco tyti tyto tytt tyty yccc yctc ygot yiti yogi yogo yoit yoot yott yoyo yyyy